U2F/WebAuthn Hardware Security Key support for iOS

[srirambv]

U2F/WebAuthn Hardware Security Key support for iOS

Feature Implementation:

• Add support for U2F/WebAuthn hardware security keys on iOS. (Add support for U2F/WebAuthn hardware security keys on iOS #1159)
• Handle special characters in error description for FIDO/FIDO2. (Handle special characters in error description for FIDO/FIDO2 #1360)
• Handle UserVerificationRequirement for FIDO2. (Handle UserVerificationRequirement for FIDO2 #1166)
• UI to avoid double-tap on security keys when unplugged. (UI to avoid double-tap on security keys when unplugged #1153)
• Webauthn ResidentKey support. (Webauthn ResidentKey support  #1284)
• Webauthn support for excludeCredentials. (Webauthn support for excludeCredentials #1285)

Bug Fixes:

• Authentication doesn't work when security key is connected and disconnected quickly. (Authentication doesn't work when security key is connected and disconnected quickly #1150)
• PINS don't work with YubiKeys. (PINS don't work with YubiKeys #1217)
• rpID can be equal or shorter as long as there is still a host. (rpID can be equal or shorter as long as there is still a host #1167)
• Security keys don't work with login.gov. (Security keys don't work with login.gov #1163)
• Security key prompt is dismissed and showed again when key is disconnected and reconnected. (Security key prompt is dismissed and showed again when key is disconnected and reconnected #1347)
• Touch key dialog shows up multiple times on hitting cancel. (Touch key dialog shows up multiple times on hitting cancel #1349)
• Unsupported browser message when security key is connected. (Unsupported browser message when security key is connected #1148)
• Update the bootstrap script to use the new YubiKit. (Update the bootstrap script to use the new YubiKit #1314)
• WebAuthn doesn't work in private mode. (WebAuthn doesn't work in private mode #1373)